US334761A - Burglar-alarm - Google Patents

Description

(No Model.)

' W. EOKERSALL.

BURGLAR ALARM. 7

No. 334,761. Patented Jan. 26,1886.

v, Ht f0 271E? UN TED STATES PATENT FFICE.

WALTER EOKERSALL, OF HYDE PARK, ILLINOIS.

BURGLAR-ALARM.

PECIFICATION forming part of Letters PatentNo. 334,761, dated January 26, 1886.

Application filed April 18, 1884. Renewed October 27, 1885. Serial No. 181,100. (No model.)

To all whom it may concern:

Be it known that I, WALTER ECKERSALL, a subject of the Queen of Great Britain, residing at Hyde Park, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Burglar- Alarms, of which the following is a specification, to wit:

This invention relates to an improvement in burglar-alarms; and it consists in certain peculiarities of the construction and arrangement of the same,substantially as will be hereinafter more fully described and claimed, whereby the door is fastened by the releasing of the alarm.

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to'describe its construction and operation, referring to the accompanying drawings, in which Figure l is an elevation of a door having my invention attached. Fig. 2 is an edge view of the door partly opened and the stopbolt in engagement, and Fig. 3 is a view of a catch-piece intended for use with this device upon windows.

A represents a door, and B the frame, of any of the usual and well-known forms. Upon the door is secured a gong or bell, O, and in close relation thereto an ordinary clockalarm mechanism, 0, having a hammer, c. This mechanism is so old and well known that it is deemed unnecessary to show it in detail in the drawings. Upon the door, adjacent'to the hammer c, is secured a spring-bolt, D,

having its rear end turned outward, as at (1,

to engage the hammer and hold it stationary. The case d of the bolt is formed with a slot, (1 through which projects a stud, 6, having a thumb-nut, e, by which the bolt may be held back when desired.

Upon the door-frame B is securedacasting, f, having a hole, f, in its outer end,as clearly shown in Fig. 2.

The operation of this deviceis evident from the drawings. During the day the bolt D is drawn back and secured by the set-nut,thereby holding the hammer from any movement. At night the nut c is loosened, thereby releasing the bolt, which rests againstthe casting f,or the frame B. Should the door be opened during the night, the slightest movement will cause the bolt to register with the hole f in the stop f, and the. spring (seen in dotted lines in the drawings) throws it forward, effectually bolting the door, and atthe same time releasing the alarm, which notifies the occupants of the house of the attempt to enter.

The device is equally well adapted to windows or other places to be protected, and in this case the alarm and bolt are placed upon the window-frame and the perforated stop plece or catch on the sash. The form of this stop may be varied at pleasure without interfering with the action of the device, only requiring a solid portion,against which the bolt normally rests, and an opening into which it is sprung on being moved.

Having thus fully described my invention, what I claim as new, and desire to secure bv Letters Patent, is v 1. A door or window and its frame, one of which is provided with a clock-alarm mechanism, and a bolt adapted when drawn back to engage and'hold the mechanism, and having means for securing it in this position at will, in combination with a stop-catch, against which the end of the bolt rests, and provided with an opening into which it may spring on being moved, to secure the door or window and sound the alarm, substantially as shown and described. 0

2. In a door and window alarm, the door or ing a hammer, c, and bolt D,having a set-nut, 6, 1n combination with the frame B, and stop f, having openingf, substantially as and for the purpose set forth.

W. O. MOARTHUR,

CHAS. KRESSMANN.

window A, hell 0, clock mechanism 0, hav-

Images